Custom Hooks Overview in React

Creating a Simple Custom Hook

Let's create a Custom Hook that tracks the window width and updates it on resize.

This hook encapsulates the logic for subscribing to window resize events and managing state.

Using Custom Hooks in Components

Once created, you can use Custom Hooks inside any functional component just like built-in Hooks.

This promotes code reuse and keeps components simpler.

• Call the Custom Hook at the top level of your component.
• Use the returned values or functions from the Custom Hook as needed.

Best Practices for Custom Hooks

To write effective Custom Hooks, follow these best practices.

• Always start the function name with 'use' to comply with React Hook rules.
• Keep hooks focused on a single responsibility.
• Avoid side effects outside of useEffect inside your Custom Hook.
• Return only necessary data or functions to keep the API clean.
• Document your Custom Hooks clearly for maintainability.

Common Mistakes with Custom Hooks

Be aware of common pitfalls when working with Custom Hooks.

• Calling Hooks conditionally inside Custom Hooks, which breaks the Rules of Hooks.
• Mutating state directly instead of using state setters.
• Not cleaning up side effects properly in useEffect.
• Returning inconsistent data shapes from the hook.